bpo-35031, test_asycio: disable TLS 1.3 in test_start_tls_server_1() (GH-14148)

bpo-35031, bpo-35998: Reintroduce workaround on Windows and FreeBSD
in test_start_tls_server_1() of test_asyncio: disable TLS v1.3 on the
client context.
1 file changed